Test for decref, undefined and versioned variables.
Test for decref, undefined and versioned variables.

As title.

IntelLabs/numba,cpcloud/numba,cpcloud/numba,seibert/numba,seibert/numba,IntelLabs/numba,numba/numba,numba/numba,IntelLabs/numba,numba/numba,numba/numba,numba/numba,IntelLabs/numba,cpcloud/numba,seibert/numba,IntelLabs/numba,cpcloud/numba,seibert/numba,seibert/numba,cpcloud/numba